The Vaporesso Aurora Play Replacement Cartridge comes in two types of atomizer resistance, 0.65 ohm and 1.3 ohm. Each resistance uniquely uses two types of e-liquid; the 0.65 ohm utilizes freebase vape juice whilst the 1.3 ohm primarily uses the nicotine salt ejuices. Both coils in each cartridge use CCELL for longevity and can accommodate 2ml of liquid in its reservoir.